Tipping customs for tour guides in Europe vary significantly by country and the type of tour. For a standard group tour, it is common to tip between €2 and €5 per person as a gesture of appreciation. For a private tour guide, the recommendation is usually higher, typically €10 to €20 for the entire group for a half-day tour, or around 10% of the total cost for a full-day experience. In "Free" walking tours, where the guide relies solely on tips, a standard contribution is usually between €10 and €15 per person. However, in Scandinavian countries and Iceland, tipping is generally not expected as service charges are included in the price, though it is never refused. Always check local norms; for instance, in the UK, tipping is less formal than in Southern or Eastern Europe.